0

Here are all the code

/////////// main.cpp ///////////////

```
#include "List.h"
#include <string>
#include <iostream>
using namespace std;
int main( )
{
List<int> myIntList;
cout << "Inserting 1 in the list...\n";
myIntList.insertFirst(1);
myIntList.printList();
cout << endl;
system("Pause");
return 0;
}
```

////// Link.h/////

```
#ifndef LIST_H
#define LIST_H
template <class T>
class Node
{
public:
Node(){}
Node(T theData, Node<T>* theLink) : data(theData), link(theLink){}
Node<T>* getLink( ) const { return link; }
const T getData( ) const { return data; }
void setData(const T& theData) { data = theData; }
void setLink(Node<T>* pointer) { link = pointer; }
private:
T data;
Node<T> *link;
};
template <class T>
class List
{
public:
List( );
//Default constructor.
//Initializes the list to an empty list.
bool isEmpty();
//Checks whether the list is empty.
void insertFirst(const T& newData);
//Inserts a new node at the beginning of the list
//param T& - new data
void printList();
//Print out the list
void insertLast(const T& newData);
//Inserts a new node at the end of the list.
int length( );
//Returns the length of the list.
T front( );
//Returns the information contained in the first node.
T back( );
//Retruns the information contained in the last node.
bool search(const T item);
//Searches the list for a given item.
//This is a sequential search.
void deleteNode(const T& deleteItem);
//Delete a node from the list with a given info.
void copyList(List<T>& otherList);
//Make an identical copy of the list
void destroyList( );
//Deallocates the memory occupied by each node.
void initializeList( );
//Initializes the list to an empty state.
//Note that the default constructor has already initialized
// the list when the list object was declared.
~List( );
//Destructor destroys the list and returns
// all the memory to the freestore when
// the class goes out of scope.
private:
Node<T> *first;
//pointer to the first node of the list
Node<T> *last;
//pointer to the last node of the list
int count;
//stores the number of elements in the list
};
#endif
```

/// Link.cpp///

```
#include "List.h"
#include<iostream>
using namespace std;
template <class T>
List<T>::List()
{
first = NULL;
last = NULL;
count = 0;
}
template <class T>
bool List<T>::isEmpty()
{
return (first == NULL);
}
template <class T>
void List<T>::insertFirst(const T& newData){
first = new Node(newData, first);
++count;
}
template <class T>
void List<T>::printList(){
Node<T> *tempt;
tempt = first;
while(tempt != NULL){
cout << tempt->getData() << " ";
tempt = tempt->getLink();
}
}
template <class T>
void List<T>::insertLast(const T& newData)
{
Node<T> *newNode; //pointer to create the new node
newNode = new Node; //create the new node
newNode->setData(newData); //store new data in the node
newNode->setLink(NULL); //insert new node at the end pointing to NULL
if (first == NULL) //if the list is empty, newNode is
// both the first and last node
{
first = newNode;
last = newNode;
++count;
}
else //the list is not empty, insert
// newNode after the last node
{
last->setLink(newNode); //insert newNode after last
last = newNode; //make last point to the actual last node
++count;
}
}
template <class T>
int List<T>::length( )
{
return count;
}
template <class T>
T List<T>::front( )
{
return first->getData(); //return the info of the
// first node
}
template <class T>
T List<T>::back( )
{
return last->getData(); //return the info of the
// last node
}
template <class T>
bool List<T>::search(const T itemToSearch)
{
Node<T> *current; //pointer to traverse the list
bool found;
current = first; //set current to point to the
// first node in the list
found = false;
while(current != NULL && !found) //search the list
if (current->getData() == itemToSearch) //the item is found
found = true;
else //otherwise
current = current->getLink(); // make current point
// to the next node
return found;
}
template <class T>
void List<T>::deleteNode(const T& deleteItem)
{
Node<T> *current; //pointer to traverse the list
Node<T> *trailCurrent; //pointer just before current
bool found;
if(first == NULL) //CASE 1; list is empty
cerr << "Cannot delete from an empty list.\n";
else
{ //CASE 2: delete first node
if(first->getData() == deleteItem)
{
current = first;
first = first->getLink();
--count;
if(first == NULL) //list has only one node
last = NULL;
delete current;
}
else //search the list for the node with the given info
{
found = false;
trailCurrent = first; //set trailCurrent to point to
// the first node
current = first->getLink(); //set current to point to the
// second node
while(current != NULL && !found)
{
if(current->getData() != deleteItem)
{
trailCurrent = current;
current = current->getLink();
}
else
found = true;
} // end while
if(found) //CASE 3; if found, delete the node
{
trailCurrent->setLink(current->getLink());
--count;
if(last == current) //node to be deleted was
// the last node
last = trailCurrent; //update the value of last
delete current; //delete the node from the list
}
else
cout << "Item to be deleted is not in the list." << endl;
}
}
}
template <class T>
void List<T>::copyList(List<T>& otherList)
{
Node<T> *newNode; //pointer to create a node
Node<T> *current; //pointer to traverse the list
if(first != NULL) //if the list is non-empty, make it empty
destroyList();
if(otherList.first == NULL) //otherList is empty
{
first = NULL;
last = NULL;
count = 0;
}
else
{
current = otherList.first; //current points to the
//list to be copied
count = otherList.count;
//copy the first node
first = new Node; //create the node
first->setData(current->getData()); //copy the info
first->setLink(NULL); //set the link field of
// the node to NULL
last = first; //make last point to the
// first node
current = current->getLink(); //make current point to
// the next node
//copy the remaining list
while(current != NULL)
{
newNode = new Node; //create a node
newNode->setData(current->getData()); //copy the info
newNode->setLink(NULL); //set the link of
// newNode to NULL
last->setLink(newNode); //attach newNode after last
last = newNode; //make last point to
// the actual last node
current = current->getLink(); //make current point to
// the next node
}
}
}
template <class T>
void List<T>::destroyList( )
{
Node<T> *temp; //pointer to deallocate the
// memory occupied by the node
while(first != NULL) //while there are nodes in the list
{
temp = first; //set temp to the current node
first = first->getLink(); //advance first to the next node
delete temp; //deallocate the memory occupied by temp
}
last = NULL; //iniitialize last to NULL
// (first has already been set to NULL
// by the while loop)
count = 0;
}
template <class T>
void List<T>::initializeList( )
{
destroyList( ); //if the list has any nodes,
// delete them
}
template <class T>
List<T>::~List( )
{
destroyList();
}
```

0

OK, so this is interesting. I have deleted most of the code but I still get the same error:

Tester.obj : error LNK2019: unresolved external symbol "public: __thiscall List<int>::List<int>(void)" (??0?$List@H@@QAE@XZ) referenced in function _main

//// Tester.cpp /////

```
#include "List.h"
#include <string>
#include <iostream>
using namespace std;
int main( )
{
List<int> myIntList;
system("Pause");
return 0;
}
```

//// List.h /////

```
#ifndef LIST_H
#define LIST_H
template <class T>
class List
{
public:
List();
};
#endif
```

/// List.cpp ////

```
#include "List.h"
#include<iostream>
using namespace std;
template <class T>
List<T>::List()
{
}
```

Question Answered as of 5 Years Ago by jonsca

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